<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>主界面</title>
</head>
<body>
<ul>
    <li><a href="register.html" target="_blank">用户注册页面</a></li>
    <li><a href="circle.html" target="_blank">计算圆的周长和面积</a></li>
</ul>
</body>
</html>